The Standard Cell Potential (E°) of a Voltaic Cell Constructed

The standard cell potential (E°) of a voltaic cell constructed using the cell reaction below is 0.76 V:

With P_H2 = 1.0 atm and [Zn²⁺] = 1.0 M, the cell potential is 0.66 V. The concentration of H⁺ in the
Cathode compartment is _ M.

A) 4.2 × 10^{- 4}
B) 1.0 × 10^{- 12}
C) 4.9 × 10¹
D) 2.0 × 10^{- 2}
E) 1.4 × 10^{- 1}